Anisotropy of Heat Transport and Its Modeling in Homogeneous Turbulent Flow

Anisotropy of Heat Transport and Its Modeling in Homogeneous Turbulent Flow

With modifications of a two-equation heat-transfer model, a new approach to analysis of heat transport in free turbulent shear flows is proposed. The modified model was tested by application to different homogeneous turbulent flows, namely decaying isotropic turbulence, homogeneous nonisotropic turb...

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Veröffentlicht in:Nihon Kikai Gakkai rombunshuu. B hen 1992/08/25, Vol.58(552), pp.2565-2570
Hauptverfasser: SUZUKI, Naruhiko, MATSUMOTO, Atsushi, NAGANO, Yasutaka, TAGAWA, Masato
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Sprache:eng ; jpn
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Numerical Prediction
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container_end_page 2570
container_issue 552
container_start_page 2565
container_title Nihon Kikai Gakkai rombunshuu. B hen
container_volume 58
creator SUZUKI, Naruhiko
MATSUMOTO, Atsushi
NAGANO, Yasutaka
TAGAWA, Masato
description With modifications of a two-equation heat-transfer model, a new approach to analysis of heat transport in free turbulent shear flows is proposed. The modified model was tested by application to different homogeneous turbulent flows, namely decaying isotropic turbulence, homogeneous nonisotropic turbulence under a return-to-isotropy process, and homogeneous turbulence with a simple shear. To represent the nonisotropic nature of heat transfer in free turbulence, we have modeled the eddy diffusivity for heat by a second rank tensor on the basis of the generalized gradient diffusion hypothesis. At the same time, when treating the time scale which characterizes the transport process of a passive scalar, we have introduced the scalar-field time scale τθ=((θ2)^^-/2)/εθ. The predictions of turbulent heat flux, temperature variance and its dissipation rate are all in satisfactory agreement with the experimental results.
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subjects Numerical Prediction
title Anisotropy of Heat Transport and Its Modeling in Homogeneous Turbulent Flow
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